LG U8120 Service Manual page 108

START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Does the sine wave appear
1
at R2619 ?
YES
Does the sine wave appear
2
at Num ber 37,38 pin
in the key Bíd CN963?
YES
Does the sine wave appear
3
at EAR(+) PAD in LCD Module?
YES
Is the soldering o t the
3
receiv er OK?
YES
Can you hear sine wave
out of the receiv er ?
YES
END
4. TROUBLE SHOOTING
NO
Change the m ain board
NO
Change the Key boar d
NO
Change t he LCD module
NO
Resolder R eceiver
NO
Change the Receiver
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